Electric water-heater.



M. H. SHOENBE RG.

ELEGTRIG WATER HEATER.

APPLICATION FILED JAN. 27, 1911.

Patented May 23, 1911.

Juventor (lflorncg witnesses UNITED STATES PATENT curios.

'MILTON H. sHo'nuBEnG, or SAN rnanoiseo, CALIFORNIA. ,ASSIGNOR To PRESTO ELEC- TRIoAL MANUFACTURING COMPANY, or sANrRAuoIsco, oamrou ua, A conso- RATION' or CALIFORNIA.

Tool! whom it may conccmi Be it known that I, Micron H. Si-IOEN- Buns, a citizen, of the United States, residing specification.

at San Francisco, in the county of San. Fran- C1SCO and State of GitllfOlIllfi, have invented new and useful Improvements-in Electric- /Vate1"-Heaters,,of which, the following is a to an apparatus for stream of water, and: 1s

invention relates heating a flowing especially designed for use in connection with a water faucet such as is used with dent-al cuspldors, although the devlce is of such a nature as to be readily applicable for use with any waterlfaucet or valve from which it is desired t draw hot water.

One object of my invention is to provide an apparatus wherein water'in its passage there through will be caused to contact with a heated element in a comparatively thinannular columnv in order that it may be heated quickly.

Another object of my invention resides in the structural arrangement or combination of I the electrical heater and the means for controlling the flow of the electrlc current therethrough.

Furthermore, my apparatus provides an exceedingly compact structure, which canbo quickly and easily attached .or detached as a unit, and in which there are no external switches or other attachments.

My invention will be clearly. understood from the following description, in connection with the accompanying drawing, in which Figure 1 is a central vertical section of an apparatus embodying my invention; and Fig. 2 is a side elevation of the same.

For purposes of illustration, I have shown my apparatus applied to a dental basin or cuspidor A, having a faucet B and a supply pipe C.

Referring now to the construction of the heater proper, my invention. comprises an outer tubular casing or shell 1, having a lining 2 of heat-insulating material, which may consist of asbestos or similar substance. The tubular casing l is internally screw threaded at the upper end to receive the cap 3, which also forms the base of the switch chamber. The cap piece is provided with a channel or bore at, having screw threaded inlet and outlet openings, into the latter of which is LECTRICWATER-HEATER, L

screwed the connection Dfwhich anay form an outer covering 1 V the inner wall or" the tube and thecore; The

with the gasket-s 12 ternall v threaded to 1 Fig. 2,

I Specification of Letters Patent. Patefi tf d 'lflay' 23,1911. Appncautiri' filed January 27, 1911. Serial No. 605,00?" J thesupport and be secured to'the dental basin or cuspldor. A cyl ndrical.core 5, ex-

.tending centrally through the. casing, is

threaded atone end at the other endrece cures the parts in Surrounding the into the eap. piece; 5,-. and

s the, nut 10- wh ich set enw I go'ista tube, 6, having fmica ;or.- i1,1sulatin I upon wnic sjfwouud aresistance coil 8, the whole .co lilglllll wthe heating element. The tube is p ret iably nzovideil with inwardly directcdifiangesat either end to slidingly engage thecore leaving .an annular water, )assage cl1annel.;9},pbetween material.

heating element is supported up'on'the core 5 by means of a nut l ich-iorc'es the ends thereof into wate1 Lightengagement 1nd may, be: exngagement with the union or" a water supp ,pipe-l The-opposite ends of the core piece; areprovidedwith a. central bore 5", having lateral openings 5 to form inlet and outlet connections .for the water channel. Inasmuch asmy heater unit ,Qan-ay be placed above the basin Q1. ieuspidorand screwed to the faucetconnection: as shown in or it may be, eonnectcdato any taucet or ,valve.

F or the purpose 0t ntrolling the electric current, I provide a-,cl amber, l-l, integral with the cap piece, within which is pivotally mounted the switch arm 15, and the contacts 16. The conductors 17, leading to the opposite ends of resistance wire 18, may be connected to contact rings 19, secured to the heater tube. The electric current is switched on or oil by means of the spring push buttons 20, which may be operated alternately upon the switch blade. The switch chamber may beprovided with a suitable closure or cover for the purpose of giving access to the interior,

It will be observed that the water passing through the heater element will be spread out into an annular column, so that a comparatively thin tubular body of water is brought into direct contact with the inner wall of the heating tube, whereby the water 105 will be heated very much more quickly, uniformly, and to a higher temperature than would be the case if it merely passed thrmmh electric energy than where the entire bore ofthe tube is used as a water channel. The inner heat insulating lining or shell 2, not only conserves the heat by preventing radiation but also serves to keep the outer metal shell from becoming heated.

The advantages of having the electric switch embodied within the heaterunit, and thus avoiding all external switches and con nections will be appreciated by those who have had any experience in using electric heaters. The faucet and push buttons can be operated by the same hand and the cur rent can be switched on just before the hot water is required, and immediately turned off when no longer needed. The unit is thus a complete article of manufacture, and is ready for immediate attachment to the water and electric connections without external appliances.

While I have described in detail the particular apparatus disclosed inthe drawings for the purpose of illustration, yet -I am aware that changes may be made therein without departing from the spirit of my invention or from the scope of my claims.

That I claim is:

1. An electric water-heater comprising a tubular casing, a tubular heater element within said casing having a resistance coil insulated therefrom and surrounding the exterior only of said heater element, a solid core, extending through said heater whereby an annular channel is formed through which channel only the water passes, and fluid inlet and outlet passages connected to the op posite ends of said channel.

'2. An. electric water-heater comprising a tubular casing, an inner tubular heat-insu- .lating lining therefor, a tubular heater element within said casing having a resistance coil' insulated therefrom and surrounding the exterior only of said heater element, asolid core extending through said heater whereby an annular channel is formed through'which channel only the water passes, fluid inlet and outlet passages connected to the opposite ends of said channel, and means for removably supporting said heater element upon said core.

3. An electric water-heater comprising a tubular casing, a tubular heater element within said casing having a resistance coil insulated therefrom and surrounding the exterior only of said heater element, a solid core extending through said heater whereby an annular channel is formed through which channei only the water passes, fluid inlet and outlet passages connected to the opposite sides of said channel, and means for removably supporting said heater element upon said core and forming a water-tight seal about the core for the ends of said heater.

4:. An electric water-heater comprising a tubular casing, a ca secured thereto having a chamber provide with an electric switch, a tubular heater-element within said casing having a surrounding insulated resistance coil connected to said switch, a core extending through said heater and secured to said cap, means for removably supporting said heater upon said core, and means projecting within said cap for operating said switch.

In'tes ,imony whereof I have hereunto set my han in presence of two subscribing witnesses. I

MILTON H. SHOENBERG. IVitnsses:

LEWIS AUREsDoRrER, M. MEAGIIER. 

